Burning up the "gma heat index." Promises you to lose weight while eating the same thing. It's like groundhog's day, you'll eat the same thing every day. You don't want it anymore. Dubbed the boredom diet and juju chang will explain it. Reporter: Subway says jared did it with subway sandwiches. I lost 245 pounds. Reporter: And kellogg's suggests you can do it by eating special k cereal. Replace two meals a day for two weeks. Reporter: Variety may be the spice of life but car yi says the not eating is it. A way of controlling calories and still be satisfied and have consistency. Reporter: It would be eating the same thing every day to lose weight, call it the boredom diet. We talked to a mono luncher who ate the same chipotle salad for eight months. I lost 50 pounds and continue to lose weight every week. Reporter: It's not unlike the cabbage soup diet where repetition leads to weight loss. Pun published study looked at 60 women who ate the same meal every day for weeks and ate less. It's a small sample to be sure, but -- the study showed women who ate mac and cheese every day for a week wound up eating 100 fewer Is that the latest word. Young people these day. Reporter: My former colleague, cnn newsmessenger cooper anderson says he sticks to the same meals. I eat the same meals for months at a time day after day. Reporter: Perhaps that's what keeps him fit and lean. While experts we talked to say it can lull you into weight loss, they say it only works if your choices are balanced. Mac and cheese says glassman is not the nutritious way to go. If you're going to have the same thing every day make sure it's portion controlled. Reporter: Juju chang, abc news, new york. All right, joining us now to talk about it is transformation specialist chris powell, host of "extreme makeover: Weight loss edition" and has a new book out called "choose more, lose more for life." You changed countless people's lives. We just did this story on the boredom diet. A lot -- george kind of eats that way. Josh kind of eats that way. You do. Lara. Is that the right thing. The thing is I think in the long term there's certainly validity to it but the only thing, though, I'm having a hard time swallowing this because it almost seems like a recipe for disaster right off the bat because people think I can eat anything. Mac and cheese, cheeseburgers and pepperoni pizza. Researchers say over time they eat 100 fewer calories but what if they overload with a thousand calories -- I think in the long term it could work. Ends on what you're eating. Should be boring and sensible. Yeah. That is boring. Sam, you're a variety guy. That's why I go up and down ten pounds. I can't help it. You have some simple exercises that can also help with trance forring ourself. As a matter of fact I do. The ultimate exercise today. We'll get right down into it. I tell you what, if there's any one exercise I could do for the rest of my life it's the burpie. Like -- exactly. Every time I say the word. Chris makes me do these. Absolutely. All right, guys, let's get down into the burpie. Upper body, core. Helen will be doing -- a beginning version. Lower body as she lowers herself to the ground and stabilizes it turns into core and stands back up. Every muscle in the body moving at once. I'm telling you if you try these at home you will get a great full workout and they seem mellow, trust me -- take a look at your mellow over here. Doing the more advanced version. A plank and qualities and bridges and doing squats again. Fantastic. You just, I tell you if there's any one move I could do for the rest of my life it's the burpie. I'll try the burpie. Absolutely. Here's what we do. In my new book I throw in all different kinds of exercises. 20 different workouts and combine them with other movements like twisters. Let's get down into some twisters. Facing out. This is an incredible exercise for the core muscles. Obliques so arms out to the side and we'll go side to side on those legs. Once again, great rotational muscles here. Good core. The twister, the burpie. I love the waffles you brought Find all of that in your new book. "Choose more, lose more." It's available right now. You can get the recipe for his protein waffle on our website goodmorningamerica.Com. Come on! There you go.

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